The Performance W9004 2-Piece Step Drill Bits range from 3/16 to 1-3/8 inches, each with a double-flute design for faster and smoother cutting. Features: * Titanium-nitride-coated for cooler and longer running * Double-flute design for faster and smoother cutting * 12 step bit sizes: 3/16-inch, 1/4-inch, 5/16-inch, 3/8-inch, 7/16-inch, 1/2-inch, 9/16-inch, 5/8-inch, 11/16-inch, 3/4-inch, 13/16-inch and 7/8-inch * 11 step bit sizes: 1/4-inch, 25/64-inch, 35/64-inch, 11/16-inch, 13/16-inch, 7/8-inch, 1-inch, 1-1/8-inch, 1-7/32-inch, 1-1/4-inch and 1-3/8-inch What"s In The Box: * Performance W9004 2-Piece Step Drill Bit Set